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Stock Incentive Plans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares issued | 200,741,777 |  | 200,741,777 |  | 199,964,041
Performance period (in years) |  |  | 3 years |  |
Percentage of target award of maximum possible payout to executives |  |  | 150.00% |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Awards expected to vest in 2016 (in shares) | 241,698 |  | 241,698 |  |
Awards expected to vest in 2017 (in shares) | 153,578 |  | 153,578 |  |
Awards expected to vest in 2018 (in shares) | 79,291 |  | 79,291 |  |
Unrecognized compensation cost | $ 4,400,000 |  | $ 4,400,000 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) |  |  | 24 months |  |
Compensation expense | $ 700,000 | $ 1,000,000 | $ 2,100,000 | $ 2,400,000 |
Number of unvested shares outstanding | 474,567 |  | 474,567 |  | 514,419
Shares vested during period |  |  | 255,828 |  |
Market Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stockholder return period (in years) |  |  | 3 years |  |
Market Stock Units [Member] | Executive Officers [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Compensation expense | $ 0 | 100,000 | $ 100,000 | 200,000 |
Number of unvested shares outstanding | 0 |  | 0 |  |
Shares vested during period |  |  | 99,047 |  |
Common stock, shares issued | 148,572 |  | 148,572 |  |
Performance Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Awards expected to vest in 2016 (in shares) | 236,398 |  | 236,398 |  |
Awards expected to vest in 2017 (in shares) | 210,756 |  | 210,756 |  |
Awards expected to vest in 2018 (in shares) | 222,460 |  | 222,460 |  |
Unrecognized compensation cost | $ 3,600,000 |  | $ 3,600,000 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) |  |  | 23 months |  |
Compensation expense | $ 600,000 | $ 400,000 | $ 1,700,000 | $ 1,000,000 |
Number of unvested shares outstanding | 669,614 |  | 669,614 |  | 436,170
Percentage of total stockholder return for payout of shares |  |  | 30.00% |  |
Performance Stock Units [Member] | Executive Officers [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of total stockholder return for payout of shares |  |  | 75.00% |  |
2004 Stock Option and Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option and Incentive plan, shares authorized | 8,000,000 |  | 8,000,000 |  |
Number of shares issued or committed to issue | 3,923,651 |  | 3,923,651 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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